"""Main module for Gixy CLI"""

import os
import sys
import logging
import copy

import gixy
from gixy.core.manager import Manager as Gixy
from gixy.formatters import get_all as formatters
from gixy.core.plugins_manager import PluginsManager
from gixy.core.config import Config
from gixy.cli.argparser import create_parser
from gixy.core.exceptions import InvalidConfiguration

LOG = logging.getLogger()


def _init_logger(debug=False):
    LOG.handlers = []
    log_level = logging.DEBUG if debug else logging.INFO

    LOG.setLevel(log_level)
    handler = logging.StreamHandler(sys.stderr)
    handler.setFormatter(logging.Formatter("[%(module)s]\t%(levelname)s\t%(message)s"))
    LOG.addHandler(handler)
    LOG.debug("logging initialized")


def _create_plugin_help(option):
    if isinstance(option, (tuple, list, set)):
        default = ",".join(list(option))
    else:
        default = str(option)

    return "Default: {0}".format(default)


def _get_cli_parser():
    parser = create_parser()
    parser.add_argument(
        "nginx_files",
        nargs="*",
        type=str,
        default=["/etc/nginx/nginx.conf"],
        metavar="nginx.conf",
        help="Path to nginx.conf, e.g. /etc/nginx/nginx.conf",
    )

    parser.add_argument(
        "-v", "--version", action="version", version="Gixy v{0}".format(gixy.version)
    )

    parser.add_argument(
        "-l",
        "--level",
        dest="level",
        action="count",
        default=0,
        help="Report issues of a given severity level or higher (-l for LOW, -ll for MEDIUM, -lll for HIGH)",
    )

    default_formatter = "console" if sys.stdout.isatty() else "text"
    available_formatters = formatters().keys()
    parser.add_argument(
        "-f",
        "--format",
        dest="output_format",
        choices=available_formatters,
        default=default_formatter,
        type=str,
        help="Specify output format",
    )

    parser.add_argument(
        "-o", "--output", dest="output_file", type=str, help="Write report to file"
    )

    parser.add_argument(
        "-d",
        "--debug",
        dest="debug",
        action="store_true",
        default=False,
        help="Turn on debug mode",
    )

    parser.add_argument(
        "--tests", dest="tests", type=str, help="Comma-separated list of tests to run"
    )

    parser.add_argument(
        "--skips", dest="skips", type=str, help="Comma-separated list of tests to skip"
    )

    parser.add_argument(
        "--disable-includes",
        dest="disable_includes",
        action="store_true",
        default=False,
        help='Disable "include" directive processing',
    )

    group = parser.add_argument_group("plugins options")
    for plugin_cls in PluginsManager().plugins_classes:
        name = plugin_cls.__name__
        if not plugin_cls.options:
            continue

        options = copy.deepcopy(plugin_cls.options)
        for opt_key, opt_val in options.items():
            option_name = "--{plugin}-{key}".format(plugin=name, key=opt_key).replace(
                "_", "-"
            )
            dst_name = "{plugin}:{key}".format(plugin=name, key=opt_key)
            opt_type = str if isinstance(opt_val, (tuple, list, set)) else type(opt_val)
            group.add_argument(
                option_name,
                metavar=opt_key,
                dest=dst_name,
                type=opt_type,
                help=_create_plugin_help(opt_val),
            )

    return parser


def main():
    parser = _get_cli_parser()
    args = parser.parse_args()
    _init_logger(args.debug)

    # generate a list of user-expanded absolute paths from the nginx_files input arguments
    nginx_files = []

    for input_path in args.nginx_files:
        if input_path == "-":
            if len(args.nginx_files) > 1:
                sys.stderr.write("Expected either file paths or stdin, got both.\n")
                sys.exit(1)

            nginx_files.append("-")
        else:
            path = os.path.expanduser(os.path.abspath(input_path))

            if not os.path.exists(path):
                sys.stderr.write(
                    "File {path!r} was not found.\nPlease specify correct path to configuration.\n".format(
                        path=path
                    )
                )
                sys.exit(1)

            nginx_files.append(path)

    try:
        severity = gixy.severity.ALL[args.level]
    except IndexError:
        sys.stderr.write(
            "Too high level filtering. Maximum level: -{0}\n".format(
                "l" * (len(gixy.severity.ALL) - 1)
            )
        )
        sys.exit(1)

    if args.tests:
        tests = [x.strip() for x in args.tests.split(",")]
    else:
        tests = None

    if args.skips:
        skips = [x.strip() for x in args.skips.split(",")]
    else:
        skips = None

    config = Config(
        severity=severity,
        output_format=args.output_format,
        output_file=args.output_file,
        plugins=tests,
        skips=skips,
        allow_includes=not args.disable_includes,
    )

    for plugin_cls in PluginsManager().plugins_classes:
        name = plugin_cls.__name__
        options = copy.deepcopy(plugin_cls.options)
        for opt_key, opt_val in options.items():
            option_name = "{name}:{key}".format(name=name, key=opt_key)
            if option_name not in args:
                continue

            val = getattr(args, option_name)
            if val is None:
                continue

            if isinstance(opt_val, tuple):
                val = tuple([x.strip() for x in val.split(",")])
            elif isinstance(opt_val, set):
                val = set([x.strip() for x in val.split(",")])
            elif isinstance(opt_val, list):
                val = [x.strip() for x in val.split(",")]
            options[opt_key] = val
        config.set_for(name, options)

    formatter = formatters()[config.output_format]()
    failed = False
    for path in nginx_files:
        with Gixy(config=config) as yoda:
            try:
                if path == "-":
                    with os.fdopen(sys.stdin.fileno(), "rb") as fdata:
                        yoda.audit("<stdin>", fdata, is_stdin=True)
                else:
                    with open(path, mode="rb") as fdata:
                        yoda.audit(path, fdata, is_stdin=False)
            except InvalidConfiguration:
                failed = True
            formatter.feed(path, yoda)
            failed = failed or sum(yoda.stats.values()) > 0

    if args.output_file:
        with open(config.output_file, "w") as f:
            f.write(formatter.flush())
    else:
        print(formatter.flush())

    if failed:
        # If something found - exit code must be 1, otherwise 0
        sys.exit(1)
    sys.exit(0)
